EP2125334A2 - Method of joining a thermoplastic material to a fibre composite material and device manufactured therewith - Google Patents

Method of joining a thermoplastic material to a fibre composite material and device manufactured therewith

Info

Publication number
EP2125334A2
EP2125334A2 EP08707973A EP08707973A EP2125334A2 EP 2125334 A2 EP2125334 A2 EP 2125334A2 EP 08707973 A EP08707973 A EP 08707973A EP 08707973 A EP08707973 A EP 08707973A EP 2125334 A2 EP2125334 A2 EP 2125334A2
Authority
EP
European Patent Office
Prior art keywords
fibre composite
composite material
thermoplastic material
thermoplastic
bracket
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08707973A
Other languages
German (de)
French (fr)
Other versions
EP2125334B1 (en
Inventor
Sabine Wlach
Jürgen Schenk
Georg Wachinger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Airbus Defence and Space GmbH
Airbus Operations GmbH
Original Assignee
EADS Deutschland GmbH
Airbus Operations GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by EADS Deutschland GmbH, Airbus Operations GmbH filed Critical EADS Deutschland GmbH
Publication of EP2125334A2 publication Critical patent/EP2125334A2/en
Application granted granted Critical
Publication of EP2125334B1 publication Critical patent/EP2125334B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/04—Layered products comprising a layer of synthetic resin as impregnant, bonding, or embedding substance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/06—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using friction, e.g. spin welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/06—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using friction, e.g. spin welding
    • B29C65/0672—Spin welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/3608—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising single particles, e.g. fillers or discontinuous fibre-reinforcements
    • B29C65/3612—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint comprising single particles, e.g. fillers or discontinuous fibre-reinforcements comprising fillers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/3644—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint being a ribbon, band or strip
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3672—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint
    • B29C65/3676—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3672—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint
    • B29C65/3676—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic
    • B29C65/368—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the composition of the elements heated by induction which remain in the joint being metallic with a polymer coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/47—Joining single elements to sheets, plates or other substantially flat surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/721—Fibre-reinforced materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/721—Fibre-reinforced materials
    • B29C66/7214—Fibre-reinforced materials characterised by the length of the fibres
    • B29C66/72141—Fibres of continuous length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/723—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered
    • B29C66/7232—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer
    • B29C66/72321—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of metals or their alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/725—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being hollow-walled or honeycombs
    • B29C66/7254—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being hollow-walled or honeycombs honeycomb structures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/34—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement"
    • B29C65/36—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction
    • B29C65/3604—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint
    • B29C65/3656—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated elements which remain in the joint, e.g. "verlorenes Schweisselement" heated by induction characterised by the type of elements heated by induction which remain in the joint being a layer of a multilayer part to be joined, e.g. for joining plastic-metal laminates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/721—Fibre-reinforced materials
    • B29C66/7212—Fibre-reinforced materials characterised by the composition of the fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/721—Fibre-reinforced materials
    • B29C66/7214—Fibre-reinforced materials characterised by the length of the fibres
    • B29C66/72143—Fibres of discontinuous lengths
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/72—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined
    • B29C66/727—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being porous, e.g. foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7394—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoset
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time
    • B29C66/949—Measuring or controlling the joining process by measuring or controlling the time characterised by specific time values or ranges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/10—Thermosetting resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/12—Thermoplastic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
    • B29K2105/0809—Fabrics
    • B29K2105/0845—Woven fabrics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/08—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of continuous length, e.g. cords, rovings, mats, fabrics, strands or yarns
    • B29K2105/10—Cords, strands or rovings, e.g. oriented cords, strands or rovings
    • B29K2105/101—Oriented
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles
    • B29K2105/14—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles oriented
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2305/00—Use of metals, their alloys or their compounds, as reinforcement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2307/00—Use of elements other than metals as reinforcement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2309/00—Use of inorganic materials not provided for in groups B29K2303/00 - B29K2307/00, as reinforcement
    • B29K2309/08—Glass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • B29L2009/003—Layered products comprising a metal layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/30—Vehicles, e.g. ships or aircraft, or body parts thereof
    • B29L2031/3076—Aircrafts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/60—Multitubular or multicompartmented articles, e.g. honeycomb
    • B29L2031/608—Honeycomb structures

Definitions

  • thermoplastic material to a fibre composite material
  • the invention relates to a method of joining a thermoplastic material to a fibre composite material.
  • the invention relates to a device comprising thermoplastic material and fibre composite material.
  • thermoplastic materials are often attached to Fibre composite materials by means of mechanical attachment, for example by means of screws, or by adhesive bonding.
  • plastics brackets which comprise thermoplastic material are often attached to components, such as for example a sidewall panel or a hat rack box, which comprise fibre composite material, within a pressurised area, for example within a cabin area of an aircraft.
  • Adhesive bonding of plastics brackets comprising thermoplastic material to components comprising fibre composite material requires very complex pretreatment of the adherend surfaces of the plastics brackets. The surfaces have first to be roughened and then pretreated with a primer. Only after this pretreatment can the plastics brackets be adhesively bonded to the components. Then it is necessary to wait for a certain period, as a rule 5 to 8 hours, until the adhesive has cured and exhibits the necessary initial adhesive strength. Adhesives which are heat-curing are also frequently used. When using such adhesives, the plastics brackets and components to be joined together have to be cured for up to 48 hours in an oven. The adhesive bonding process is thus very complex and time-consuming. Moreover, the adhesives include constituents which are hazardous to health.
  • plastics brackets comprising thermoplastic material are often attached to components comprising fibre composite material by means of screws.
  • thermoplastic material to a fibre composite material which is less complex and time-consumi ⁇ g than known adhesive bonding methods, which, moreover, does not use any additional substances hazardous to health and which makes it simpler to change the position at which a thermoplastic material is joined to a fibre composite material compared with mechanical attachment, such as for example by means of screws.
  • thermoplastic material is a fibre-reinforced matrix material or comprises a fibre-reinforced matrix material and wherein the matrix material is a thermoset or comprises a thermoset.
  • thermoplastic material By welding the thermoplastic material to the fibre composite material, the time needed for joining the materials is very greatly reduced. It amounts in particular to just a few seconds. In addition, generally the materials do not have to be pretreated, and no additional substances hazardous to health are required. Moreover, no holes have to be formed in the components and plastics brackets, so making it easier to change the position at which the thermoplastic material is joined to the fibre composite material. It is preferable for the thermoplastic material to be welded to the fibre composite material by "motion welding".
  • motion welding covers any relative motion between the thermoplastic material and the fibre composite material which generates heat of motion in the joint area which is sufficient to weld together the thermoplastic material and the fibre composite material.
  • thermoplastic material and the fibre composite material are moved relative to one another during motion welding in particular in such a way that the thermoplastic material is moved relative to the fibre composite material in such a way that the thermoplastic material starts to melt and the fibre composite material is heated. It is further preferred for the thermoplastic material and the fibre composite material to be moved relative to one another during motion welding in particular in such a way that the thermoplastic material is moved relative to the fibre composite material and the thermoplastics material and the fibre composite material are pressed against one another in such a way that the thermoplastic material starts to melt and the fibre composite material is heated.
  • the motion welding allows a heat of motion, in particular a heat of friction, to be generated in the joint area between the thermoplastic material and the fibre composite material which is sufficient to weld the two materials together.
  • the energy of the motion welding may also be used for targeted removal of the thermoplastic material.
  • the relative motion may be generated for example by rotary motion and/or vibratory motion of the thermoplastic material and of the fibre composite material relative to one another.
  • the fibre composite material and the thermoplastic material are preferably joined together by vibration welding.
  • vibration welding heat of friction is generated by the vibratory motion in the joint area between the thermoplastic material and the fibre composite material which is sufficient to weld together the two materials.
  • thermoplastic material it is additionally preferable for the thermoplastic material to be welded to the fibre composite material by induction welding.
  • an electrically conductive material is arranged in a joint area between the thermoplastic material and the fibre composite material and induction heat is generated in the electrically conductive material which is sufficient to cause the thermoplastic material to start to melt and to heat the fibre composite material.
  • induction welding currents are preferably induced in the electrically conductive material which generate the induction heat by means of resistance effects and/or magnetic hysteresis.
  • metallic particles and/or a metallic layer is/are introduced into the joint area between the thermoplastic material and the fibre composite material.
  • the electrically conductive material is a slotted and stretched metal foil, for example, e.g. the metal foil with the tradename
  • the electrically conductive material is preferentially made of and/or comprises aluminium and/or copper. It is further preferred that the electrically conductive material is a metallic woven material and/or a metallic layer. It is further preferred that the electrically conductive material comprises or consists of metallic nano particles.
  • the electrically conductive material, in particular the metallic layer is preferentially generated by a thermal spraying method of one or several metal powders, which can comprise one or several metals, or by using a sintering technique with one or several metals or by melting of one or several metal foils and/or of one or several solder materials, in particular, on the thermoplastic material.
  • induction heat is generated by using a medium frequency or a high frequency.
  • a frequency within a frequency range of 10 to 50 kHz is used, in particular with a power within a range of 2 to 5 kW.
  • a frequency within a frequency range of 400 kHz to 1 MHz is used, in particular with a power smaller than 25 kW.
  • the fibre composite material comprises CFRP material and an induction heat is generated in the CFRP material, in particular, without using an additional electrically conductive material.
  • the induction heat is preferentially generated close to the surface of the CFRP material.
  • the fibre composite material is a fibre-reinforced matrix material or comprises a fibre-reinforced matrix material.
  • the matrix material is a thermoset or comprises a thermoset. It is preferable for fibres of the fibre composite material to be unidirectionally oriented or to form a woven fabric.
  • the fibre composite material is therefore preferably a fibre-reinforced plastic (FRP), i.e. in particular an in particular reinforced, thermoplastic and/or thermosetting matrix material provided with unidirectional fibres or fibres forming a woven fabric.
  • FRP fibre-reinforced plastic
  • the fibre composite material is additionally possible for the fibre composite material to be produced using a resin, in particular a polyaddition and/or a polycondensation resin.
  • the fibre composite material is preferably arranged on a honeycomb structure, in particular a Nomex honeycomb.
  • the honeycomb structure takes the form in particular of a layer, and the fibre composite material is applied in layers to two mutually facing sides of the honeycomb structure.
  • thermoplastic material to consist of one or more engineering thermoplastics or to comprise one or more engineering thermoplastics. Provision may further be made for the thermoplastic material to consist of polyamide or to comprise polyamide.
  • thermoplastic material can consist of or comprise polyetherimid (PEI) and/or polyetheretherketone (PEEK).
  • PEI polyetherimid
  • PEEK polyetheretherketone
  • the thermoplastic material comprises a fibre reinforcement, in particular a short fibre reinforcement, wherein the fibres can be, for example, carbon fibres and/or glass fibres.
  • the thermoplastic material does not comprise a fibre reinforcement.
  • thermoplastic material is a constituent of a bracket, in particular a support bracket, or for the bracket to consist of the thermoplastic material, and for the fibre composite material to be a constituent of a component or for the component to consist of the fibre composite material, such that the thermoplastic material of the bracket is welded together with the fibre composite material of the component in order to join the bracket to the component to form a bracket arrangement.
  • a bracket may in this manner be joined simply and quickly to a component.
  • the bracket of thermoplastic material is set in motion, while the fibre composite material of the component, to which it is to be joined, does not move.
  • the bracket is preferably so constructed that it may support desired objects.
  • the invention additionally relates to a device comprising thermoplastic material and Fibre composite material, the thermoplastic material and the fibre composite material comprising a joint which may be produced by the method according to the invention.
  • Fig. 1 is a schematic view of a device with which an embodiment of the method according to the invention may be performed
  • Fig. 2 shows a layered structure of a joint according to the invention between an FRP material and a thermoplastic material
  • Fig. 3 shows a sandwich with FRP material
  • Fig. 4 shows a schematic view of an aircraft with a cabin space, in which a bracket arrangement is arranged
  • Fig. 5 shows a schematic cross-sectional view of a bracket comprising thermoplastic material.
  • Fig. 1 shows a schematic view of a device 1 for joining a thermoplastic material to a fibre composite material, wherein the fibre composite material is a fibre- reinforced matrix material or comprises a fibre-reinforced matrix material and wherein the matrix material is a thermoset or comprises a thermoset.
  • the device 1 comprises a turning and lifting unit 2 and a control unit 3, which is connected to the turning and lifting unit 2 and controls it.
  • the device 1 additionally comprises a bracket holder 4, to which a bracket 5 may be detachably attached.
  • the bracket holder 4 is held rotationally and height-adjustably in the turning and lifting unit, such that the turning and lifting unit 2 may turn the bracket 5 by means of the bracket holder 4 and modify its position as regards height.
  • the device 1 additionally comprises a fibre composite material holder 6, on which fibre composite material 7, in this embodiment FRP material, is held.
  • a bracket 5 for example in the height position illustrated in Fig. 1 , may be inserted into the bracket holder 4.
  • a fibre composite material 7, in particular an FRP material may be inserted into the fibre composite material holder 6.
  • the bracket holder 4 is moved in the direction of the fibre composite material 7, such that the bracket 5 comes into contact with the fibre composite material 7 with a predetermined pressure.
  • the bracket 5 begins to turn with a predetermined frequency due to the bracket holder 4.
  • Fig. 4 shows a schematic sectional view of an aircraft 30 with a cabin area 31 pressurisable when in operation.
  • a component 32 which comprises fibre composite material, in particular FRP material, or consists thereof.
  • the component 32 is joined to a bracket 33, which comprises thermoplastic material or consists of thermoplastic material.
  • the joint between the component 32 and the bracket 33 may be produced by the above- described method according to the invention.
  • the joint between the fibre composite material and the thermoplastic material differs from a welded joint between other materials.
  • the microscopic structure of the joint between a thermoplastic material and a fibre composite material which may be produced by means of the method according to the invention, differs from the microscopic structure of a welded joint between other materials, for example between two metallic materials.
  • the fibre composite material 7 is held by a fibre composite material holder 6.
  • the fibre composite material 7 may also be part of a larger component, for example a sidewall panel or a hat rack box, which is held either by a corresponding holder or has already been mounted for example in a cabin area of an aircraft. In the latter case, no holder is needed to hold the fibre composite material or to hold the component.
  • the turning and lifting unit 2 and the control unit 3 may take the form, for example, of the stationary device described in US 5,160,393.
  • the turning and lifting unit 2, the control unit 3 and the bracket holder 4 may also be of hand-held construction.
  • the bracket 5 comprises thermoplastic material at least in the area of the joint with the fibre composite material, which material is joined to the fibre composite material in a manner according to the invention.
  • a resultant sequence of layers in the joint area is shown schematically in Fig. 2.
  • the thermoplastic material 10 is welded to the fibre composite material 11.
  • the fibre composite material 11 is applied to a honeycomb structure 12, in particular to a Nomex honeycomb.
  • the honeycomb structure 12 is applied in turn to a second layer 13 of fibre composite material.
  • the thermoplastic material 10 is preferably an engineering thermoplastic and more preferably polyamide. According to the invention, however, the thermoplastic material may also be a standard thermoplastic or a high performance thermoplastic.
  • the engineering thermoplastic used may preferably be PA66 (with or without glass fibres), in particular PA66-GF30 und PA60-GF30, PA12, PC (polycarbonates) or PMMA.
  • PA66, PA12 and PC are preferably provided with flame retardant and therefore preferably comprise particularly good fire characteristics.
  • the high performance thermoplastic used may preferably be PEI (polyetherimides), with or without glass fibres, and glass fibre-reinforced modifications thereof.
  • Further high performance thermoplastic materials may be, for example: aromatic polyetherketones (PAEK), PPSU (polyphenylsulfone) and PAI (polyamideimides).
  • the fibre composite material 1 1 which is preferably an FRP material, may for example comprise carbon fibres and/or glass fibres, in particular a CFRP material and/or a GRP material.
  • the fibre composite material is preferably produced using a resin, in particular using a polyaddition and/or polycondensation resin.
  • the sequence of layers comprising fibre composite material layers 11 , 13 and an interposed honeycomb structure 12 is also known as a sandwich.
  • a foam may be used instead of or in addition to the honeycomb structure d.
  • Fig. 3 is a schematic diagram of a sandwich with a fibre composite material layer 11 on top in Fig. 3 and a fibre composite material layer 13 at the bottom in Fig. 3, these enclosing a layer 14 with a honeycomb structure 15 or a foam 16.
  • a honeycomb structure 15 or a foam 16 For reasons of clarity, in Fig. 3 part of the fibre composite material layer 11 has been removed.
  • the fibre composite material layer 11 completely covers the layer 14.
  • both the honeycomb structure 15 and the foam 16 are additionally illustrated.
  • the sandwich is preferably a Nomex honeycomb.
  • the layers 1 1 , 13 of the fibre composite material preferably have a thickness in the range from 0.1 to 0.2 mm and more preferably a thickness of 0.15 mm.
  • the microscopic sequence of the joining process may possibly be described as follows.
  • the surface of the thermoplastic material passes into a high- viscosity phase, which lies above the glass transition range and below the melting point. This means that the thermoplastic material merely starts to melt.
  • the surface of the fibre composite material is heated and enters into a quasi-chemical union with the high-viscosity phase of the thermoplastic material.
  • the fibre composite material comprises resins, in particular polyaddition and/or polycondensation resins, resins which may as yet be uncured enter into a quasi-chemical union with the high-viscosity phase of the thermoplastic material, i.e.
  • the resins may not be cured completely, for example, more than 50 per cent of the resins may be cured, in particular more than 80 percent may be cured, wherein uncured resins may enter into a quasi- chemical union with the high-viscosity phase of the thermoplastic material.
  • the joint could come about in that the high-viscosity thermoplastic material of the bracket is drawn through micropores in the fibre composite material, such that the thermoplastic material penetrates the fibre composite material, so producing the joint.
  • the high-viscosity thermoplastic material could, moreover, be drawn into the fibre composite material and through the fibre composite material in such a way that it effects anchoring on the side of the fibre composite material remote from the thermoplastic material and so produces the joint.
  • the high-viscosity phase of the thermoplastic material could in particular be drawn through the fibre composite material when the fibre composite material is applied to a honeycomb structure, as shown for example in Fig. 2. Due to the porosity of the fibre composite material, a capillary effect could arise in the direction of the honeycomb structure, which may at least in places cause the high-viscosity thermoplastic material to be drawn into the fibre composite material.
  • the thermoplastic material is welded to the fibre composite material by induction welding, wherein an electrically conductive material is arranged in a joint area between the thermoplastic material and the fibre composite material.
  • the electrically conductive material is a slotted and stretched metal foil, for example, a metal foil with the tradename Astrostrike.
  • the electrically conductive material is preferentially made of and/or comprises aluminium and/or copper.
  • the electrically conductive material is a metallic woven material and/or a metallic layer.
  • the electrically conductive material comprises or consists of metallic nano particles.
  • the electrically conductive material, in particular the metallic layer is preferentially generated by a thermal spraying method of one or several metal powders, which can comprise one or several metals, or by using a sintering technique with one or several metals or by melting of one or several metal foils and/or of one or several solder materials, in particular, on the thermoplastic material.
  • induction heat is generated by using a medium frequency or a high frequency. It is preferred that a frequency within a frequency range of 10 to 50 kHz is used, in particular with a power within a range of 2 to 5 kW. In a further preferred embodiment, a frequency within a frequency range of 400 kHz to 1 MHz is used, in particular with a power smaller than 25 kW.
  • the fibre composite material comprises CFRP material and an induction heat is generated in the CFRP material, in particular, without using an additional electrically conductive material.
  • the induction heat is preferentially generated close to the surface of the CFRP material.
  • Example 1 Examples of the method according to the invention for joining a thermoplastic material to a fibre composite material are described below.
  • Example 1
  • a bracket which comprises thermoplastic material and is illustrated schematically and by way of example in Fig. 5, is joined to a fibre composite material, which in this embodiment is an FRP material.
  • the bracket 33 comprises a disc-shaped attachment portion 34, which is joined to the FRP material, and a holding element 35.
  • the attachment portion 34 and the holding element 35 have a polyamide PA66 content of 70% and a glass fibre content of 30%.
  • the holding element 35 serves to hold an object, such as for example an electrical lead or heavier objects.
  • the thickness of the attachment portion amounts in this example to 2.2 mm, and the diameter of the attachment portion amounts in this example to 24 mm.
  • the FRP material is a GRP laminate, the top outer ply of the laminate, with which the surface 36 of the bracket 33 is to be connected, being 40% resin and 60% glass fibre fabric.
  • the thickness of the laminate amounts to 2 mm.
  • the bracket is secured in the bracket holder 4 of the device 1 illustrated schematically in Fig. 1. Furthermore, the GRP laminate, i.e. the FRP material, is secured in the holder 6 of the device 1. The bracket is then pressed by means of the turning and lifting unit 2 and the bracket holder 4 onto the GRP laminate and turned relative to the GRP laminate in order to generate heat of motion and to join the GRP laminate to the bracket.
  • the GRP laminate i.e. the FRP material
  • the pressure which acts during the welding process between the thermoplastic material and the FRP material amounts in this example to 0.5, 1.0 and 1.5 bar.
  • a joint was produced in this example according to the invention between the bracket, which comprises the thermoplastic material, and the FRP material.
  • the bracket which comprises thermoplastic material
  • the welding depth amounts in this exemplary embodiment to 0.35 mm.
  • the welding process was controlled by means of the welding depth, i.e. the welding process was terminated as soon as the predetermined welding depth had been reached.
  • tensile shear strength was determined.
  • Each of the joints produced according to the invention has excellent tensile shear strengths. These tensile shear strengths are sufficient, for example, to attach brackets for holding heavy objects to FRP components.
  • the bracket described in Example 1 is used.
  • the FRP material is CFRP laminate, the top outer ply of the laminate, to which the bracket is joined, being 45% resin and 55% carbon fibre fabric.
  • the thickness of the laminate amounts to 2 mm.
  • thermoplastic material (bracket) to an FRP material (surface of the CFRP laminate) was performed using the device 1 illustrated schematically in Fig. 1 .
  • the angular frequency amounts to 160 Hz and the welding time to 3 s.
  • the welding time is the time for which the bracket is moved relative to the FRP material and a predetermined pressure, which amounts in this example to 1.0 bar, is present between the thermoplastic material and the FRP material.
  • the welding process is regulated in this example by means of the welding time, i.e. the welding process was performed in each case for 3 s. In these examples too, the tensile shear strength was determined.
  • thermoplastic material Joints between a thermoplastic material and an FRP material produced with the test parameters according to Example 2 exhibit excellent tensile shear strengths, which are sufficient for example to attach a bracket of thermoplastic material for holding heavy objects to an FRP component.
  • motion welding has been described in the examples, the invention is not limited to motion welding. According to the invention, any type of welding may be used which leads to the development of heat which is sufficient to produce the joint according to the invention.
  • the heat may also be introduced by means of radiation, in particular by infrared welding or laser welding. Alternatively or in addition, the heat may also be introduced by convection, in particular by hot gas welding or extrusion welding or by non- contact welding using hot air.
  • thermoplastic material may be welded together with the fibre composite material by induction welding.
  • an electrically conductive material is arranged in a joint area between the thermoplastic material and the fibre composite material and induction heat is generated in the electrically conductive material which is sufficient to cause the thermoplastic material to start to melt and to heat the fibre composite material.
  • induction welding currents are preferably induced in the electrically conductive material which generate the induction heat by means of resistance effects and/or magnetic hysteresis.
  • metallic particles and/or a metallic layer is/are introduced into the joint area between the thermoplastic material and the fibre composite material.
  • bracket which is joined to an FRP material
  • the invention is not restricted to joining a bracket to an FRP material.
  • other objects which comprise thermoplastic material and/or consist thereof may be joined to fibre composite material, in particular to FRP material.
  • the invention is also not restricted to specific bracket shapes.
  • the invention is not restricted to circular motion between the thermoplastic material and the fibre composite material.
  • any relative motion between these two materials, during which the fibre composite material and the thermoplastic material are in contact with one another, may be used in order to generate the heat of motion needed for the welding process.
  • This relative motion may be composed of rotary motion and linear motion.
  • the relative motion may also be just linear motion.
  • the invention is not restricted to the pressures, welding times, welding depths or frequencies stated in the exemplary embodiment.
  • any desired relative motion between the thermoplastic material and the fibre composite material may be performed and any desired pressures may be used between the fibre composite material and the thermoplastic material, as long as a heat of motion is generated which is sufficient to weld these two materials together.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)

Abstract

The invention relates to a method of joining a thermoplastic material (10) to a fibre composite material (11), the thermoplastic material (10) being welded to the fibre composite material (11), wherein the fibre composite material is a fibre-rein-=forced matrix material or comprises a fibre-reinforced matrix material and wherein the matrix material is a thermoset or comprises a thermoset. Preferably, the thermoplastic material (10) and the fibre composite material (11) are welded together by motion welding and/or by induction welding. In addition, it is preferred that, for the preferred induction welding, an electrically conductive material is arranged in a joint area between the thermoplastic material and the fibre composite material and induction heat is generated in the electrically conductive material which is sufficient to cause the thermoplastic material to start to melt and to heat the fibre composite material.

Description

Method of joining a thermoplastic material to a fibre composite material
The invention relates to a method of joining a thermoplastic material to a fibre composite material. In addition, the invention relates to a device comprising thermoplastic material and fibre composite material.
In aircraft construction in particular, thermoplastic materials are often attached to Fibre composite materials by means of mechanical attachment, for example by means of screws, or by adhesive bonding. For example, plastics brackets which comprise thermoplastic material are often attached to components, such as for example a sidewall panel or a hat rack box, which comprise fibre composite material, within a pressurised area, for example within a cabin area of an aircraft.
Adhesive bonding of plastics brackets comprising thermoplastic material to components comprising fibre composite material requires very complex pretreatment of the adherend surfaces of the plastics brackets. The surfaces have first to be roughened and then pretreated with a primer. Only after this pretreatment can the plastics brackets be adhesively bonded to the components. Then it is necessary to wait for a certain period, as a rule 5 to 8 hours, until the adhesive has cured and exhibits the necessary initial adhesive strength. Adhesives which are heat-curing are also frequently used. When using such adhesives, the plastics brackets and components to be joined together have to be cured for up to 48 hours in an oven. The adhesive bonding process is thus very complex and time-consuming. Moreover, the adhesives include constituents which are hazardous to health.
Alternatively or in addition, plastics brackets comprising thermoplastic material are often attached to components comprising fibre composite material by means of screws. This has the disadvantage, however, that the size and position of the holes for the screws have to be known as early as during production of the plastics brackets and the components and that, in the event of a change to the attachment position in the components and/or in the plastics brackets, new holes have to be introduced. This is disadvantageous for the entire production process.
It is the object of the present invention to provide a method of joining a thermoplastic material to a fibre composite material which is less complex and time-consumiηg than known adhesive bonding methods, which, moreover, does not use any additional substances hazardous to health and which makes it simpler to change the position at which a thermoplastic material is joined to a fibre composite material compared with mechanical attachment, such as for example by means of screws.
This object is achieved by a method of joining a thermoplastic material to a fibre composite material in which the thermoplastic material is welded to the fibre composite material, wherein the fibre composite material is a fibre-reinforced matrix material or comprises a fibre-reinforced matrix material and wherein the matrix material is a thermoset or comprises a thermoset.
By welding the thermoplastic material to the fibre composite material, the time needed for joining the materials is very greatly reduced. It amounts in particular to just a few seconds. In addition, generally the materials do not have to be pretreated, and no additional substances hazardous to health are required. Moreover, no holes have to be formed in the components and plastics brackets, so making it easier to change the position at which the thermoplastic material is joined to the fibre composite material. It is preferable for the thermoplastic material to be welded to the fibre composite material by "motion welding". The term "motion welding" covers any relative motion between the thermoplastic material and the fibre composite material which generates heat of motion in the joint area which is sufficient to weld together the thermoplastic material and the fibre composite material. It is further preferred for the thermoplastic material and the fibre composite material to be moved relative to one another during motion welding in particular in such a way that the thermoplastic material is moved relative to the fibre composite material in such a way that the thermoplastic material starts to melt and the fibre composite material is heated. It is further preferred for the thermoplastic material and the fibre composite material to be moved relative to one another during motion welding in particular in such a way that the thermoplastic material is moved relative to the fibre composite material and the thermoplastics material and the fibre composite material are pressed against one another in such a way that the thermoplastic material starts to melt and the fibre composite material is heated.
In a simple manner, the motion welding allows a heat of motion, in particular a heat of friction, to be generated in the joint area between the thermoplastic material and the fibre composite material which is sufficient to weld the two materials together.
In the same way, the energy of the motion welding may also be used for targeted removal of the thermoplastic material.
The relative motion may be generated for example by rotary motion and/or vibratory motion of the thermoplastic material and of the fibre composite material relative to one another. When using a vibratory motion, the fibre composite material and the thermoplastic material are preferably joined together by vibration welding. In vibration welding, heat of friction is generated by the vibratory motion in the joint area between the thermoplastic material and the fibre composite material which is sufficient to weld together the two materials.
It is additionally preferable for the thermoplastic material to be welded to the fibre composite material by induction welding. For this purpose, an electrically conductive material is arranged in a joint area between the thermoplastic material and the fibre composite material and induction heat is generated in the electrically conductive material which is sufficient to cause the thermoplastic material to start to melt and to heat the fibre composite material. In induction welding, currents are preferably induced in the electrically conductive material which generate the induction heat by means of resistance effects and/or magnetic hysteresis. Preferably, to generate the induction heat, metallic particles and/or a metallic layer is/are introduced into the joint area between the thermoplastic material and the fibre composite material.
It is further preferred that the electrically conductive material is a slotted and stretched metal foil, for example, e.g. the metal foil with the tradename
Astrostrike. The electrically conductive material is preferentially made of and/or comprises aluminium and/or copper. It is further preferred that the electrically conductive material is a metallic woven material and/or a metallic layer. It is further preferred that the electrically conductive material comprises or consists of metallic nano particles. The electrically conductive material, in particular the metallic layer, is preferentially generated by a thermal spraying method of one or several metal powders, which can comprise one or several metals, or by using a sintering technique with one or several metals or by melting of one or several metal foils and/or of one or several solder materials, in particular, on the thermoplastic material.
It is further preferred that induction heat is generated by using a medium frequency or a high frequency. In a preferred embodiment, a frequency within a frequency range of 10 to 50 kHz is used, in particular with a power within a range of 2 to 5 kW. In a further preferred embodiment, a frequency within a frequency range of 400 kHz to 1 MHz is used, in particular with a power smaller than 25 kW.
In a further preferred embodiment, the fibre composite material comprises CFRP material and an induction heat is generated in the CFRP material, in particular, without using an additional electrically conductive material. The induction heat is preferentially generated close to the surface of the CFRP material. The fibre composite material is a fibre-reinforced matrix material or comprises a fibre-reinforced matrix material. The matrix material is a thermoset or comprises a thermoset. It is preferable for fibres of the fibre composite material to be unidirectionally oriented or to form a woven fabric. The fibre composite material is therefore preferably a fibre-reinforced plastic (FRP), i.e. in particular an in particular reinforced, thermoplastic and/or thermosetting matrix material provided with unidirectional fibres or fibres forming a woven fabric. It is additionally possible for the fibre composite material to be produced using a resin, in particular a polyaddition and/or a polycondensation resin. The fibre composite material is preferably arranged on a honeycomb structure, in particular a Nomex honeycomb. In this case, the honeycomb structure takes the form in particular of a layer, and the fibre composite material is applied in layers to two mutually facing sides of the honeycomb structure.
Provision may be made for the thermoplastic material to consist of one or more engineering thermoplastics or to comprise one or more engineering thermoplastics. Provision may further be made for the thermoplastic material to consist of polyamide or to comprise polyamide. Furthermore, the thermoplastic material can consist of or comprise polyetherimid (PEI) and/or polyetheretherketone (PEEK). In a preferred embodiment, the thermoplastic material comprises a fibre reinforcement, in particular a short fibre reinforcement, wherein the fibres can be, for example, carbon fibres and/or glass fibres. In a further preferred embodiment, the thermoplastic material does not comprise a fibre reinforcement.
By using this stated fibre composite material and thermoplastic materials, it is possible to produce a particularly good joint between these materials using the method according to the invention.
It is additionally preferable for the thermoplastic material to be a constituent of a bracket, in particular a support bracket, or for the bracket to consist of the thermoplastic material, and for the fibre composite material to be a constituent of a component or for the component to consist of the fibre composite material, such that the thermoplastic material of the bracket is welded together with the fibre composite material of the component in order to join the bracket to the component to form a bracket arrangement. A bracket may in this manner be joined simply and quickly to a component.
If the fibre composite material is joined to the thermoplastic material by motion welding, it is preferable for the bracket of thermoplastic material to be set in motion, while the fibre composite material of the component, to which it is to be joined, does not move.
Provision may be made for the component to be a sidewall panel in an aircraft, preferably in a space in the aircraft which is pressurisable when in operation, in particular in the cabin space of the aircraft, and/or a hat rack box of the aircraft or a part of the sidewall panel and/or a part of the hat rack box. Furthermore, it is preferable for the method to be performed within an aircraft, preferably within a space pressurisable when in operation, in particular within a cabin space, of an aircraft. The method according to the invention thus makes it possible simply, quickly and reliably to produce a welded joint between a thermoplastic material and a fibre composite material, in particular in an aircraft.
The bracket is preferably so constructed that it may support desired objects.
The invention additionally relates to a device comprising thermoplastic material and Fibre composite material, the thermoplastic material and the fibre composite material comprising a joint which may be produced by the method according to the invention.
Preferred configurations of the device are listed in claims 20 to 24.
Preferred embodiments of the invention are explained in greater detail below with reference to drawings, in which
Fig. 1 is a schematic view of a device with which an embodiment of the method according to the invention may be performed,
Fig. 2 shows a layered structure of a joint according to the invention between an FRP material and a thermoplastic material, Fig. 3 shows a sandwich with FRP material,
Fig. 4 shows a schematic view of an aircraft with a cabin space, in which a bracket arrangement is arranged, and
Fig. 5 shows a schematic cross-sectional view of a bracket comprising thermoplastic material.
Fig. 1 shows a schematic view of a device 1 for joining a thermoplastic material to a fibre composite material, wherein the fibre composite material is a fibre- reinforced matrix material or comprises a fibre-reinforced matrix material and wherein the matrix material is a thermoset or comprises a thermoset. The device 1 comprises a turning and lifting unit 2 and a control unit 3, which is connected to the turning and lifting unit 2 and controls it. The device 1 additionally comprises a bracket holder 4, to which a bracket 5 may be detachably attached. The bracket holder 4 is held rotationally and height-adjustably in the turning and lifting unit, such that the turning and lifting unit 2 may turn the bracket 5 by means of the bracket holder 4 and modify its position as regards height. The device 1 additionally comprises a fibre composite material holder 6, on which fibre composite material 7, in this embodiment FRP material, is held.
By means of the device 1 , a bracket 5, for example in the height position illustrated in Fig. 1 , may be inserted into the bracket holder 4. Furthermore, a fibre composite material 7, in particular an FRP material, may be inserted into the fibre composite material holder 6. Once the bracket 5 and the fibre composite material 7 have been inserted into the corresponding holders 4, 6, the bracket holder 4 is moved in the direction of the fibre composite material 7, such that the bracket 5 comes into contact with the fibre composite material 7 with a predetermined pressure. Before, during or after build-up of the predetermined pressure between the bracket 5 and the fibre composite material 7, the bracket 5 begins to turn with a predetermined frequency due to the bracket holder 4. As a result of the rotary motion, the surface of the bracket 5, which consists of thermoplastic material or comprises thermoplastic material, and the surface of the fibre composite material 7 rub against one another, so producing heat of motion. This motion process is maintained until a heat of motion has been generated which is sufficient to join the two surfaces together. The motion is then stopped, and the surfaces cool down. The heating phase and the cooling phase each last only a few seconds, in particular each phase lasts less than 5 seconds.
Fig. 4 shows a schematic sectional view of an aircraft 30 with a cabin area 31 pressurisable when in operation. Within the cabin area 31 a component 32 is arranged which comprises fibre composite material, in particular FRP material, or consists thereof. The component 32 is joined to a bracket 33, which comprises thermoplastic material or consists of thermoplastic material. The joint between the component 32 and the bracket 33 may be produced by the above- described method according to the invention.
The joint between the fibre composite material and the thermoplastic material differs from a welded joint between other materials. In particular, the microscopic structure of the joint between a thermoplastic material and a fibre composite material, which may be produced by means of the method according to the invention, differs from the microscopic structure of a welded joint between other materials, for example between two metallic materials.
In Fig. 1 , the fibre composite material 7 is held by a fibre composite material holder 6. According to the invention, however, the fibre composite material 7 may also be part of a larger component, for example a sidewall panel or a hat rack box, which is held either by a corresponding holder or has already been mounted for example in a cabin area of an aircraft. In the latter case, no holder is needed to hold the fibre composite material or to hold the component.
The turning and lifting unit 2 and the control unit 3 may take the form, for example, of the stationary device described in US 5,160,393. Alternatively, the turning and lifting unit 2, the control unit 3 and the bracket holder 4 may also be of hand-held construction.
The bracket 5 comprises thermoplastic material at least in the area of the joint with the fibre composite material, which material is joined to the fibre composite material in a manner according to the invention. A resultant sequence of layers in the joint area is shown schematically in Fig. 2. The thermoplastic material 10 is welded to the fibre composite material 11. In this embodiment, the fibre composite material 11 is applied to a honeycomb structure 12, in particular to a Nomex honeycomb. Preferably, the honeycomb structure 12 is applied in turn to a second layer 13 of fibre composite material.
The thermoplastic material 10 is preferably an engineering thermoplastic and more preferably polyamide. According to the invention, however, the thermoplastic material may also be a standard thermoplastic or a high performance thermoplastic. The engineering thermoplastic used may preferably be PA66 (with or without glass fibres), in particular PA66-GF30 und PA60-GF30, PA12, PC (polycarbonates) or PMMA. The materials PA66, PA12 and PC are preferably provided with flame retardant and therefore preferably comprise particularly good fire characteristics.
The high performance thermoplastic used may preferably be PEI (polyetherimides), with or without glass fibres, and glass fibre-reinforced modifications thereof. Further high performance thermoplastic materials may be, for example: aromatic polyetherketones (PAEK), PPSU (polyphenylsulfone) and PAI (polyamideimides).
The fibre composite material 1 1 , which is preferably an FRP material, may for example comprise carbon fibres and/or glass fibres, in particular a CFRP material and/or a GRP material. The fibre composite material is preferably produced using a resin, in particular using a polyaddition and/or polycondensation resin. The sequence of layers comprising fibre composite material layers 11 , 13 and an interposed honeycomb structure 12 is also known as a sandwich. A foam may be used instead of or in addition to the honeycomb structure d.
Fig. 3 is a schematic diagram of a sandwich with a fibre composite material layer 11 on top in Fig. 3 and a fibre composite material layer 13 at the bottom in Fig. 3, these enclosing a layer 14 with a honeycomb structure 15 or a foam 16. For reasons of clarity, in Fig. 3 part of the fibre composite material layer 11 has been removed. Preferably, the fibre composite material layer 11 completely covers the layer 14. For reasons of clarity, in Fig. 3 both the honeycomb structure 15 and the foam 16 are additionally illustrated. It is preferable, however, for the sandwich to comprise only either a honeycomb structure 15 or a foam 16 between the fibre composite material layers 11 , 13. The honeycomb structure is preferably a Nomex honeycomb.
The layers 1 1 , 13 of the fibre composite material preferably have a thickness in the range from 0.1 to 0.2 mm and more preferably a thickness of 0.15 mm.
The microscopic sequence of the joining process may possibly be described as follows.
During welding, the surface of the thermoplastic material passes into a high- viscosity phase, which lies above the glass transition range and below the melting point. This means that the thermoplastic material merely starts to melt. At the same time, the surface of the fibre composite material is heated and enters into a quasi-chemical union with the high-viscosity phase of the thermoplastic material. If the fibre composite material comprises resins, in particular polyaddition and/or polycondensation resins, resins which may as yet be uncured enter into a quasi-chemical union with the high-viscosity phase of the thermoplastic material, i.e. the resins may not be cured completely, for example, more than 50 per cent of the resins may be cured, in particular more than 80 percent may be cured, wherein uncured resins may enter into a quasi- chemical union with the high-viscosity phase of the thermoplastic material. Moreover, the joint could come about in that the high-viscosity thermoplastic material of the bracket is drawn through micropores in the fibre composite material, such that the thermoplastic material penetrates the fibre composite material, so producing the joint. The high-viscosity thermoplastic material could, moreover, be drawn into the fibre composite material and through the fibre composite material in such a way that it effects anchoring on the side of the fibre composite material remote from the thermoplastic material and so produces the joint. The high-viscosity phase of the thermoplastic material could in particular be drawn through the fibre composite material when the fibre composite material is applied to a honeycomb structure, as shown for example in Fig. 2. Due to the porosity of the fibre composite material, a capillary effect could arise in the direction of the honeycomb structure, which may at least in places cause the high-viscosity thermoplastic material to be drawn into the fibre composite material.
In another embodiment, the thermoplastic material is welded to the fibre composite material by induction welding, wherein an electrically conductive material is arranged in a joint area between the thermoplastic material and the fibre composite material. It is preferred that the electrically conductive material is a slotted and stretched metal foil, for example, a metal foil with the tradename Astrostrike. The electrically conductive material is preferentially made of and/or comprises aluminium and/or copper. In another preferred embodiment, the electrically conductive material is a metallic woven material and/or a metallic layer. In a further preferred embodiment, the electrically conductive material comprises or consists of metallic nano particles. The electrically conductive material, in particular the metallic layer, is preferentially generated by a thermal spraying method of one or several metal powders, which can comprise one or several metals, or by using a sintering technique with one or several metals or by melting of one or several metal foils and/or of one or several solder materials, in particular, on the thermoplastic material.
In a preferred embodiment, induction heat is generated by using a medium frequency or a high frequency. It is preferred that a frequency within a frequency range of 10 to 50 kHz is used, in particular with a power within a range of 2 to 5 kW. In a further preferred embodiment, a frequency within a frequency range of 400 kHz to 1 MHz is used, in particular with a power smaller than 25 kW.
In a further preferred embodiment, the fibre composite material comprises CFRP material and an induction heat is generated in the CFRP material, in particular, without using an additional electrically conductive material. The induction heat is preferentially generated close to the surface of the CFRP material.
Examples of the method according to the invention for joining a thermoplastic material to a fibre composite material are described below. Example 1
According to Example 1 , a bracket, which comprises thermoplastic material and is illustrated schematically and by way of example in Fig. 5, is joined to a fibre composite material, which in this embodiment is an FRP material.
In this exemplary embodiment, the bracket 33 comprises a disc-shaped attachment portion 34, which is joined to the FRP material, and a holding element 35. The attachment portion 34 and the holding element 35 have a polyamide PA66 content of 70% and a glass fibre content of 30%. The holding element 35 serves to hold an object, such as for example an electrical lead or heavier objects. The thickness of the attachment portion amounts in this example to 2.2 mm, and the diameter of the attachment portion amounts in this example to 24 mm.
In this example, the FRP material is a GRP laminate, the top outer ply of the laminate, with which the surface 36 of the bracket 33 is to be connected, being 40% resin and 60% glass fibre fabric. The thickness of the laminate amounts to 2 mm.
The bracket is secured in the bracket holder 4 of the device 1 illustrated schematically in Fig. 1. Furthermore, the GRP laminate, i.e. the FRP material, is secured in the holder 6 of the device 1. The bracket is then pressed by means of the turning and lifting unit 2 and the bracket holder 4 onto the GRP laminate and turned relative to the GRP laminate in order to generate heat of motion and to join the GRP laminate to the bracket.
The pressure which acts during the welding process between the thermoplastic material and the FRP material amounts in this example to 0.5, 1.0 and 1.5 bar. For each of these pressures a joint was produced in this example according to the invention between the bracket, which comprises the thermoplastic material, and the FRP material. During the welding process, the bracket, which comprises thermoplastic material, is rotated relative to the FRP material in this exemplary embodiment at an angular frequency of 120 Hz. The welding depth amounts in this exemplary embodiment to 0.35 mm. In this exemplary embodiment the welding process was controlled by means of the welding depth, i.e. the welding process was terminated as soon as the predetermined welding depth had been reached.
To check the joints between the thermoplastic material and the FRP material, tensile shear strength was determined. Each of the joints produced according to the invention has excellent tensile shear strengths. These tensile shear strengths are sufficient, for example, to attach brackets for holding heavy objects to FRP components.
Example 2
In this example too, the bracket described in Example 1 is used. In this example, the FRP material is CFRP laminate, the top outer ply of the laminate, to which the bracket is joined, being 45% resin and 55% carbon fibre fabric. The thickness of the laminate amounts to 2 mm.
The method according to the invention for connecting a thermoplastic material (bracket) to an FRP material (surface of the CFRP laminate) was performed using the device 1 illustrated schematically in Fig. 1 .
In this example the angular frequency amounts to 160 Hz and the welding time to 3 s. The welding time is the time for which the bracket is moved relative to the FRP material and a predetermined pressure, which amounts in this example to 1.0 bar, is present between the thermoplastic material and the FRP material. The welding process is regulated in this example by means of the welding time, i.e. the welding process was performed in each case for 3 s. In these examples too, the tensile shear strength was determined.
Joints between a thermoplastic material and an FRP material produced with the test parameters according to Example 2 exhibit excellent tensile shear strengths, which are sufficient for example to attach a bracket of thermoplastic material for holding heavy objects to an FRP component. Although motion welding has been described in the examples, the invention is not limited to motion welding. According to the invention, any type of welding may be used which leads to the development of heat which is sufficient to produce the joint according to the invention. For example, the heat may also be introduced by means of radiation, in particular by infrared welding or laser welding. Alternatively or in addition, the heat may also be introduced by convection, in particular by hot gas welding or extrusion welding or by non- contact welding using hot air.
In addition, the thermoplastic material may be welded together with the fibre composite material by induction welding. For this purpose, an electrically conductive material is arranged in a joint area between the thermoplastic material and the fibre composite material and induction heat is generated in the electrically conductive material which is sufficient to cause the thermoplastic material to start to melt and to heat the fibre composite material. In induction welding, currents are preferably induced in the electrically conductive material which generate the induction heat by means of resistance effects and/or magnetic hysteresis. Preferably, to generate the induction heat, metallic particles and/or a metallic layer is/are introduced into the joint area between the thermoplastic material and the fibre composite material.
Although the invention has been described by way of example with reference to a bracket, which is joined to an FRP material, the invention is not restricted to joining a bracket to an FRP material. According to the invention, other objects which comprise thermoplastic material and/or consist thereof may be joined to fibre composite material, in particular to FRP material. The invention is also not restricted to specific bracket shapes.
Furthermore, the invention is not restricted to circular motion between the thermoplastic material and the fibre composite material. According to the invention, any relative motion between these two materials, during which the fibre composite material and the thermoplastic material are in contact with one another, may be used in order to generate the heat of motion needed for the welding process. This relative motion may be composed of rotary motion and linear motion. In addition, the relative motion may also be just linear motion. The invention is not restricted to the pressures, welding times, welding depths or frequencies stated in the exemplary embodiment. As already explained above, according to the invention any desired relative motion between the thermoplastic material and the fibre composite material may be performed and any desired pressures may be used between the fibre composite material and the thermoplastic material, as long as a heat of motion is generated which is sufficient to weld these two materials together.

Claims

Claims
1. A method of joining a thermoplastic material (10) to a fibre composite material (1 1 ), the thermoplastic material (10) being welded to the fibre composite material (11 ), wherein the fibre composite material is a fibre- reinforced matrix material or comprises a fibre-reinforced matrix material and wherein the matrix material is a thermoset or comprises a thermoset.
2. A method according to claim 1 , characterised in that the thermoplastic material (10) is welded to the fibre composite material (1 1 ) by motion welding.
3. A method according to claim 2, characterised in that, during motion welding, the thermoplastic material (10) and the fibre composite material (11 ) are moved relative to one another in such a way that the thermoplastic material (10) starts to melt and the fibre composite material (1 1 ) is heated.
4. A method according to claim 3, characterised in that, during motion welding, the thermoplastic material (10) and the fibre composite material (1 1 ) are moved relative to one another in such a way and the thermoplastic material (10) and the fibre composite material (1 1 ) are pressed against one another in such a way that the thermoplastic material (10) starts to melt and the fibre composite material (1 1 ) is heated.
5. A method according to any one of the preceding claims, characterised in that the thermoplastic material is welded to the fibre composite material by induction welding.
6. A method according to claim 5, characterised in that an electrically conductive material is arranged in a joint area between the thermoplastic material and the fibre composite material and induction heat is generated in the electrically conductive material which is sufficient to cause the thermoplastic material to start to melt and to heat the fibre composite material.
7. A method according to claim 6, wherein the electrically conductive material is a slotted and stretched metal foil.
8. A method according to claim 5, wherein the induction heat is generated by using a medium frequency or a high frequency.
9. A method according to any one of the preceding claims, characterised in that fibres of the fibre composite material are unidirectionally oriented or form a woven fabric.
10. A method according to any one of the preceding claims, characterised in that the fibre composite material (11 ) comprises carbon fibres and/or glass fibres, preferably a CFRP material and/or a GRP material.
11. A method according to any one of the preceding claims, characterised in that the fibre composite material (11 ) is produced using a resin, in particular using a polyaddition and/or polycondensation resin.
12. A method according to any one of the preceding claims, characterised in that the fibre composite material (1 1 ) is arranged on a honeycomb structure (15), in particular a Nomex honeycomb.
13. A method according to claim 12, characterised in that the honeycomb structure (15) takes the form of a layer and the fibre composite material (11 ) is applied in layers on two mutually facing sides of the honeycomb structure (15).
14. A method according to any one of the preceding claims, characterised in that the thermoplastic material (10) consists of one or more engineering thermoplastics or comprises one or more engineering thermoplastics.
15. A method according to any one of the preceding claims, characterised in that the thermoplastic material (10) consists of polyamide or comprises polyamide.
16. A method according to any one of the preceding claims, characterised in that the thermoplastic material (10) is a constituent of a bracket (33) or that the bracket (33) consists of the thermoplastic material (10), and in that the fibre composite material (11 ) is a constituent of a component (32) or that the component (32) consists of the fibre composite material (11 ), such that the thermoplastic material (10) of the bracket (33) is welded together with the fibre composite material (1 1 ) of the component (32) in order to join the bracket (33) to the component (32) to form a bracket arrangement.
17. A method according to claim 16, characterised in that the component is a sidewall panel in an aircraft (30), preferably in a space (31 ) in the aircraft which is pressurisable when in operation, and/or a hat rack box of the aircraft or a part of the sidewall panel and/or a part of the hat rack box.
18. A method according to any one of the preceding claims, characterised in that the method is performed within an aircraft (30), preferably within a space (31 ) in an aircraft (30) pressurisable when in operation.
19. A device comprising thermoplastic material (10) and fibre composite material (11 ), wherein the thermoplastic material (10) and the fibre composite material (11 ) comprise a joint, wherein the fibre composite material is a fibre- reinforced matrix material or comprises a fibre-reinforced matrix material and wherein the matrix material is a thermoset or comprises a thermoset, the joint being producible using a method according to any one of claims 1 to 18.
20. A device according to claim 19, characterised in that the device comprises a sequence of layers with a first layer comprising or consisting of thermoplastic material (10), a second layer joined to the first layer by the joint and comprising or consisting of fibre composite material (11 ) and a third layer (12), which is arranged on the side of the second layer remote from the joint, comprising or consisting of a honeycomb structure and/or a foam.
21. A device according to any one of claims 19 or 20, characterised in that the device comprises a bracket arrangement with a bracket (33) and a component (32), the thermoplastic material (10) being a constituent of the bracket (33) or the bracket (33) comprising the thermoplastic material (10), the fibre composite material (11 ) being a constituent of the component (32) or the component (32) comprising the fibre composite material (1 1 ), the bracket (33) being joined to the component (32) by the joint.
22. A device according to claim 21 , characterised in that the component is a sidewall panel in an aircraft (30), preferably in a space (31 ) in the aircraft which is pressurisable when in operation, preferably in the cabin space of the aircraft, and/or a hat rack box of the aircraft (30) or a part of the sidewall panel and/or a part of the hat rack box.
23. A device according to any one of claims 21 or 22, characterised in that the bracket arrangement is arranged within an aircraft (30), preferably within a space in an aircraft (30) pressurisable when in operation.
24. A device according to any one of claims 19 to 23, characterised in that the device is an aircraft (30).
EP20080707973 2007-01-17 2008-01-17 Method of joining a thermoplastic material to a fibre composite material and device manufactured therewith Active EP2125334B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007003357A DE102007003357A1 (en) 2007-01-17 2007-01-17 Method for bonding a thermoplastic material to a fiber composite material
PCT/EP2008/050528 WO2008087194A2 (en) 2007-01-17 2008-01-17 Method of welding a thermoplastic material to a fibre composite material and device manufactured therewith

Publications (2)

Publication Number Publication Date
EP2125334A2 true EP2125334A2 (en) 2009-12-02
EP2125334B1 EP2125334B1 (en) 2012-03-07

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US (1) US20110062287A1 (en)
EP (1) EP2125334B1 (en)
JP (1) JP2010516494A (en)
CN (1) CN101730618B (en)
AT (1) ATE548176T1 (en)
BR (1) BRPI0806735A2 (en)
CA (1) CA2676317A1 (en)
DE (1) DE102007003357A1 (en)
RU (1) RU2463163C2 (en)
WO (1) WO2008087194A2 (en)

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Also Published As

Publication number Publication date
BRPI0806735A2 (en) 2011-09-13
CN101730618B (en) 2012-12-26
EP2125334B1 (en) 2012-03-07
CN101730618A (en) 2010-06-09
JP2010516494A (en) 2010-05-20
CA2676317A1 (en) 2008-07-24
WO2008087194A3 (en) 2008-09-18
RU2463163C2 (en) 2012-10-10
DE102007003357A1 (en) 2008-07-24
US20110062287A1 (en) 2011-03-17
WO2008087194A2 (en) 2008-07-24
RU2009131076A (en) 2011-02-27
ATE548176T1 (en) 2012-03-15

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